Influence of temperature on infection and establishment of 'Candidates Liberibacter americanus' and 'Candidatus Liberibacter asiaticus' in citrus plants
Identifieur interne : 000095 ( PascalFrancis/Corpus ); précédent : 000094; suivant : 000096Influence of temperature on infection and establishment of 'Candidates Liberibacter americanus' and 'Candidatus Liberibacter asiaticus' in citrus plants
Auteurs : M. C. G. Gasparoto ; H. D. Coletta-Filho ; R. B. Bassanezi ; S. A. Lopes ; S. A. Lourenco ; L. AmorimSource :
- Plant pathology [ 0032-0862 ] ; 2012.
Descripteurs français
- Pascal (Inist)
English descriptors
Abstract
The objectives of this work were (i) to determine the influence of temperature on infection of citrus by 'Candidatus Liberibacter asiaticus' and 'Candidatus Liberibacter americanus', the two bacterial species associated with citrus huanglongbing (HLB) in Brazil, and (ii) to determine the influence of temperature on citrus colonization by 'Ca. L. asiaticus', which has taken over from 'Ca. L. americanus' as the predominant species in Brazil since 2008. Two experiments were carried out with graft-inoculated Valencia oranges on Rangpur lime rootstocks. Immediately after inoculation the plants were maintained for 423 days in growth chambers under the following night/day temperature conditions: 17/22, 22/27 or 27/32°C, with a dark/light photoperiod of 8/16 h. Infection and colonization of plants were determined using quantitative PCR (qPCR). 'Candidatus Liberibacter americanus' did not infect the plants maintained at 27/32°C; however, infection by 'Ca. L. asiaticus' occurred at all studied temperatures. Two months after inoculation, 'Ca. L. asiaticus' was distributed throughout the inoculated plants, with mean C, values in the range of 30-31 for leaves and 25-28 for roots. Over time, 'Ca. L. asiaticus' reached the highest titres in mature leaves (mean Ct value = 26.7) of citrus plants maintained at 22/27°C. 'Candidatus Liberibacter asiaticus' colonization of citrus plants was negatively affected by the daily temperature regime of 27/32°C (mean Ct value in mature leaves = 33.6).
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Format Inist (serveur)
| NO : | PASCAL 12-0297411 INIST |
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| ET : | Influence of temperature on infection and establishment of 'Candidates Liberibacter americanus' and 'Candidatus Liberibacter asiaticus' in citrus plants |
| AU : | GASPAROTO (M. C. G.); COLETTA-FILHO (H. D.); BASSANEZI (R. B.); LOPES (S. A.); LOURENCO (S. A.); AMORIM (L.) |
| AF : | Departamento de Fitopatologia e Nematologia, Universidade de São Paulo/ESALQ Av. Padua Dias 11, CP 9/CEP 13418-900 Piracicaba, São Paulo/Brésil (1 aut., 5 aut., 6 aut.); Centro APTA Citros Sylvio Moreira, IAC, Rod. Anhanguera km 158, CP 4/CEP 13490-970 Cordeirópolis, São Paulo/Brésil (2 aut.); Fundo de Defesa da Citricultura (FUNDECITRUS), Av. Dr. Adhemar Pereira de Barros 201, Vila Melhado/CEP 14807-040 Araraquara, São Paulo/Brésil (3 aut., 4 aut.) |
| DT : | Publication en série; Niveau analytique |
| SO : | Plant pathology; ISSN 0032-0862; Coden PLPAAD; Royaume-Uni; Da. 2012; Vol. 61; No. 4; Pp. 658-664; Bibl. 3/4 p. |
| LA : | Anglais |
| EA : | The objectives of this work were (i) to determine the influence of temperature on infection of citrus by 'Candidatus Liberibacter asiaticus' and 'Candidatus Liberibacter americanus', the two bacterial species associated with citrus huanglongbing (HLB) in Brazil, and (ii) to determine the influence of temperature on citrus colonization by 'Ca. L. asiaticus', which has taken over from 'Ca. L. americanus' as the predominant species in Brazil since 2008. Two experiments were carried out with graft-inoculated Valencia oranges on Rangpur lime rootstocks. Immediately after inoculation the plants were maintained for 423 days in growth chambers under the following night/day temperature conditions: 17/22, 22/27 or 27/32°C, with a dark/light photoperiod of 8/16 h. Infection and colonization of plants were determined using quantitative PCR (qPCR). 'Candidatus Liberibacter americanus' did not infect the plants maintained at 27/32°C; however, infection by 'Ca. L. asiaticus' occurred at all studied temperatures. Two months after inoculation, 'Ca. L. asiaticus' was distributed throughout the inoculated plants, with mean C, values in the range of 30-31 for leaves and 25-28 for roots. Over time, 'Ca. L. asiaticus' reached the highest titres in mature leaves (mean Ct value = 26.7) of citrus plants maintained at 22/27°C. 'Candidatus Liberibacter asiaticus' colonization of citrus plants was negatively affected by the daily temperature regime of 27/32°C (mean Ct value in mature leaves = 33.6). |
| CC : | 002A34F |
| FD : | Effet température; Infection; Colonisation; Phytopathologie; Rutaceae; Citrus sinensis; <<>>; Liberibacter americanus; Liberibacter asiaticus |
| FG : | Dicotyledones; Angiospermae; Spermatophyta; Phytopathogène; Rhizobiaceae; Bactérie; Facteur milieu; Agrume; Arbre fruitier; Plante fruitière; Microorganisme; Procaryote; Rhizobiales; Alphaproteobacteria; Proteobacteria |
| ED : | Temperature effect; Infection; Colonization; Plant pathology; Rutaceae; Citrus sinensis |
| EG : | Dicotyledones; Angiospermae; Spermatophyta; Plant pathogen; Rhizobiaceae; Bacteria; Environmental factor; Citrus fruit; Fruit tree; Fruit crop; Microorganism; Prokaryote |
| SD : | Efecto temperatura; Infección; Colonización; Fitopatología; Rutaceae; Citrus sinensis |
| LO : | INIST-7414.354000500840120050 |
| ID : | 12-0297411 |
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Padua Dias 11, CP 9</s1><s2>CEP 13418-900 Piracicaba, São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">12-0297411</idno><date when="2012">2012</date><idno type="stanalyst">PASCAL 12-0297411 INIST</idno><idno type="RBID">Pascal:12-0297411</idno><idno type="wicri:Area/PascalFrancis/Corpus">000095</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Influence of temperature on infection and establishment of 'Candidates Liberibacter americanus' and 'Candidatus Liberibacter asiaticus' in citrus plants</title><author><name sortKey="Gasparoto, M C G" sort="Gasparoto, M C G" uniqKey="Gasparoto M" first="M. C. G." last="Gasparoto">M. C. G. Gasparoto</name><affiliation><inist:fA14 i1="01"><s1>Departamento de Fitopatologia e Nematologia, Universidade de São Paulo/ESALQ Av. Padua Dias 11, CP 9</s1><s2>CEP 13418-900 Piracicaba, São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Coletta Filho, H D" sort="Coletta Filho, H D" uniqKey="Coletta Filho H" first="H. D." last="Coletta-Filho">H. D. Coletta-Filho</name><affiliation><inist:fA14 i1="02"><s1>Centro APTA Citros Sylvio Moreira, IAC, Rod. Anhanguera km 158, CP 4</s1><s2>CEP 13490-970 Cordeirópolis, São Paulo</s2><s3>BRA</s3><sZ>2 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Bassanezi, R B" sort="Bassanezi, R B" uniqKey="Bassanezi R" first="R. B." last="Bassanezi">R. B. Bassanezi</name><affiliation><inist:fA14 i1="03"><s1>Fundo de Defesa da Citricultura (FUNDECITRUS), Av. Dr. Adhemar Pereira de Barros 201, Vila Melhado</s1><s2>CEP 14807-040 Araraquara, São Paulo</s2><s3>BRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Lopes, S A" sort="Lopes, S A" uniqKey="Lopes S" first="S. A." last="Lopes">S. A. Lopes</name><affiliation><inist:fA14 i1="03"><s1>Fundo de Defesa da Citricultura (FUNDECITRUS), Av. Dr. Adhemar Pereira de Barros 201, Vila Melhado</s1><s2>CEP 14807-040 Araraquara, São Paulo</s2><s3>BRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Lourenco, S A" sort="Lourenco, S A" uniqKey="Lourenco S" first="S. A." last="Lourenco">S. A. Lourenco</name><affiliation><inist:fA14 i1="01"><s1>Departamento de Fitopatologia e Nematologia, Universidade de São Paulo/ESALQ Av. Padua Dias 11, CP 9</s1><s2>CEP 13418-900 Piracicaba, São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Amorim, L" sort="Amorim, L" uniqKey="Amorim L" first="L." last="Amorim">L. Amorim</name><affiliation><inist:fA14 i1="01"><s1>Departamento de Fitopatologia e Nematologia, Universidade de São Paulo/ESALQ Av. Padua Dias 11, CP 9</s1><s2>CEP 13418-900 Piracicaba, São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14></affiliation></author></analytic><series><title level="j" type="main">Plant pathology</title><title level="j" type="abbreviated">Plant pathol.</title><idno type="ISSN">0032-0862</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Plant pathology</title><title level="j" type="abbreviated">Plant pathol.</title><idno type="ISSN">0032-0862</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Citrus sinensis</term><term>Colonization</term><term>Infection</term><term>Plant pathology</term><term>Rutaceae</term><term>Temperature effect</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Effet température</term><term>Infection</term><term>Colonisation</term><term>Phytopathologie</term><term>Rutaceae</term><term>Citrus sinensis</term><term><<>></term><term>Liberibacter americanus</term><term>Liberibacter asiaticus</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The objectives of this work were (i) to determine the influence of temperature on infection of citrus by 'Candidatus Liberibacter asiaticus' and 'Candidatus Liberibacter americanus', the two bacterial species associated with citrus huanglongbing (HLB) in Brazil, and (ii) to determine the influence of temperature on citrus colonization by 'Ca. L. asiaticus', which has taken over from 'Ca. L. americanus' as the predominant species in Brazil since 2008. Two experiments were carried out with graft-inoculated Valencia oranges on Rangpur lime rootstocks. Immediately after inoculation the plants were maintained for 423 days in growth chambers under the following night/day temperature conditions: 17/22, 22/27 or 27/32°C, with a dark/light photoperiod of 8/16 h. Infection and colonization of plants were determined using quantitative PCR (qPCR). 'Candidatus Liberibacter americanus' did not infect the plants maintained at 27/32°C; however, infection by 'Ca. L. asiaticus' occurred at all studied temperatures. Two months after inoculation, 'Ca. L. asiaticus' was distributed throughout the inoculated plants, with mean C, values in the range of 30-31 for leaves and 25-28 for roots. Over time, 'Ca. L. asiaticus' reached the highest titres in mature leaves (mean C<sub>t</sub> value = 26.7) of citrus plants maintained at 22/27°C. 'Candidatus Liberibacter asiaticus' colonization of citrus plants was negatively affected by the daily temperature regime of 27/32°C (mean C<sub>t</sub> value in mature leaves = 33.6).</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0032-0862</s0></fA01><fA02 i1="01"><s0>PLPAAD</s0></fA02><fA03 i2="1"><s0>Plant pathol.</s0></fA03><fA05><s2>61</s2></fA05><fA06><s2>4</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Influence of temperature on infection and establishment of 'Candidates Liberibacter americanus' and 'Candidatus Liberibacter asiaticus' in citrus plants</s1></fA08><fA11 i1="01" i2="1"><s1>GASPAROTO (M. C. G.)</s1></fA11><fA11 i1="02" i2="1"><s1>COLETTA-FILHO (H. D.)</s1></fA11><fA11 i1="03" i2="1"><s1>BASSANEZI (R. B.)</s1></fA11><fA11 i1="04" i2="1"><s1>LOPES (S. A.)</s1></fA11><fA11 i1="05" i2="1"><s1>LOURENCO (S. A.)</s1></fA11><fA11 i1="06" i2="1"><s1>AMORIM (L.)</s1></fA11><fA14 i1="01"><s1>Departamento de Fitopatologia e Nematologia, Universidade de São Paulo/ESALQ Av. Padua Dias 11, CP 9</s1><s2>CEP 13418-900 Piracicaba, São Paulo</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></fA14><fA14 i1="02"><s1>Centro APTA Citros Sylvio Moreira, IAC, Rod. Anhanguera km 158, CP 4</s1><s2>CEP 13490-970 Cordeirópolis, São Paulo</s2><s3>BRA</s3><sZ>2 aut.</sZ></fA14><fA14 i1="03"><s1>Fundo de Defesa da Citricultura (FUNDECITRUS), Av. Dr. Adhemar Pereira de Barros 201, Vila Melhado</s1><s2>CEP 14807-040 Araraquara, São Paulo</s2><s3>BRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></fA14><fA20><s1>658-664</s1></fA20><fA21><s1>2012</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>7414</s2><s5>354000500840120050</s5></fA43><fA44><s0>0000</s0><s1>© 2012 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>3/4 p.</s0></fA45><fA47 i1="01" i2="1"><s0>12-0297411</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Plant pathology</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>The objectives of this work were (i) to determine the influence of temperature on infection of citrus by 'Candidatus Liberibacter asiaticus' and 'Candidatus Liberibacter americanus', the two bacterial species associated with citrus huanglongbing (HLB) in Brazil, and (ii) to determine the influence of temperature on citrus colonization by 'Ca. L. asiaticus', which has taken over from 'Ca. L. americanus' as the predominant species in Brazil since 2008. Two experiments were carried out with graft-inoculated Valencia oranges on Rangpur lime rootstocks. Immediately after inoculation the plants were maintained for 423 days in growth chambers under the following night/day temperature conditions: 17/22, 22/27 or 27/32°C, with a dark/light photoperiod of 8/16 h. Infection and colonization of plants were determined using quantitative PCR (qPCR). 'Candidatus Liberibacter americanus' did not infect the plants maintained at 27/32°C; however, infection by 'Ca. L. asiaticus' occurred at all studied temperatures. Two months after inoculation, 'Ca. L. asiaticus' was distributed throughout the inoculated plants, with mean C, values in the range of 30-31 for leaves and 25-28 for roots. Over time, 'Ca. L. asiaticus' reached the highest titres in mature leaves (mean C<sub>t</sub> value = 26.7) of citrus plants maintained at 22/27°C. 'Candidatus Liberibacter asiaticus' colonization of citrus plants was negatively affected by the daily temperature regime of 27/32°C (mean C<sub>t</sub> value in mature leaves = 33.6).</s0></fC01><fC02 i1="01" i2="X"><s0>002A34F</s0></fC02><fC03 i1="01" i2="X" l="FRE"><s0>Effet température</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="ENG"><s0>Temperature effect</s0><s5>01</s5></fC03><fC03 i1="01" i2="X" l="SPA"><s0>Efecto temperatura</s0><s5>01</s5></fC03><fC03 i1="02" i2="X" l="FRE"><s0>Infection</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="ENG"><s0>Infection</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="SPA"><s0>Infección</s0><s5>02</s5></fC03><fC03 i1="03" i2="X" l="FRE"><s0>Colonisation</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="ENG"><s0>Colonization</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="SPA"><s0>Colonización</s0><s5>03</s5></fC03><fC03 i1="04" i2="X" l="FRE"><s0>Phytopathologie</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="ENG"><s0>Plant pathology</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="SPA"><s0>Fitopatología</s0><s5>04</s5></fC03><fC03 i1="05" i2="X" l="FRE"><s0>Rutaceae</s0><s2>NS</s2><s5>05</s5></fC03><fC03 i1="05" i2="X" l="ENG"><s0>Rutaceae</s0><s2>NS</s2><s5>05</s5></fC03><fC03 i1="05" i2="X" l="SPA"><s0>Rutaceae</s0><s2>NS</s2><s5>05</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Citrus sinensis</s0><s2>NS</s2><s5>10</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Citrus sinensis</s0><s2>NS</s2><s5>10</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Citrus sinensis</s0><s2>NS</s2><s5>10</s5></fC03><fC03 i1="07" i2="X" l="FRE"><s0><<>></s0><s4>INC</s4><s5>68</s5></fC03><fC03 i1="08" i2="X" l="FRE"><s0>Liberibacter americanus</s0><s4>INC</s4><s5>72</s5></fC03><fC03 i1="09" i2="X" l="FRE"><s0>Liberibacter asiaticus</s0><s4>INC</s4><s5>73</s5></fC03><fC07 i1="01" i2="X" l="FRE"><s0>Dicotyledones</s0><s2>NS</s2></fC07><fC07 i1="01" i2="X" l="ENG"><s0>Dicotyledones</s0><s2>NS</s2></fC07><fC07 i1="01" i2="X" l="SPA"><s0>Dicotyledones</s0><s2>NS</s2></fC07><fC07 i1="02" i2="X" l="FRE"><s0>Angiospermae</s0><s2>NS</s2></fC07><fC07 i1="02" i2="X" l="ENG"><s0>Angiospermae</s0><s2>NS</s2></fC07><fC07 i1="02" i2="X" l="SPA"><s0>Angiospermae</s0><s2>NS</s2></fC07><fC07 i1="03" i2="X" l="FRE"><s0>Spermatophyta</s0><s2>NS</s2></fC07><fC07 i1="03" i2="X" l="ENG"><s0>Spermatophyta</s0><s2>NS</s2></fC07><fC07 i1="03" i2="X" l="SPA"><s0>Spermatophyta</s0><s2>NS</s2></fC07><fC07 i1="04" i2="X" l="FRE"><s0>Phytopathogène</s0><s5>31</s5></fC07><fC07 i1="04" i2="X" l="ENG"><s0>Plant pathogen</s0><s5>31</s5></fC07><fC07 i1="04" i2="X" l="SPA"><s0>Fitopatógeno</s0><s5>31</s5></fC07><fC07 i1="05" i2="X" l="FRE"><s0>Rhizobiaceae</s0><s2>NS</s2><s5>32</s5></fC07><fC07 i1="05" i2="X" l="ENG"><s0>Rhizobiaceae</s0><s2>NS</s2><s5>32</s5></fC07><fC07 i1="05" i2="X" l="SPA"><s0>Rhizobiaceae</s0><s2>NS</s2><s5>32</s5></fC07><fC07 i1="06" i2="X" l="FRE"><s0>Bactérie</s0></fC07><fC07 i1="06" i2="X" l="ENG"><s0>Bacteria</s0></fC07><fC07 i1="06" i2="X" l="SPA"><s0>Bacteria</s0></fC07><fC07 i1="07" i2="X" l="FRE"><s0>Facteur milieu</s0><s5>33</s5></fC07><fC07 i1="07" i2="X" l="ENG"><s0>Environmental factor</s0><s5>33</s5></fC07><fC07 i1="07" i2="X" l="SPA"><s0>Factor medio</s0><s5>33</s5></fC07><fC07 i1="08" i2="X" l="FRE"><s0>Agrume</s0><s5>39</s5></fC07><fC07 i1="08" i2="X" l="ENG"><s0>Citrus fruit</s0><s5>39</s5></fC07><fC07 i1="08" i2="X" l="SPA"><s0>Agrios</s0><s5>39</s5></fC07><fC07 i1="09" i2="X" l="FRE"><s0>Arbre fruitier</s0><s5>40</s5></fC07><fC07 i1="09" i2="X" l="ENG"><s0>Fruit tree</s0><s5>40</s5></fC07><fC07 i1="09" i2="X" l="SPA"><s0>Arbol frutal</s0><s5>40</s5></fC07><fC07 i1="10" i2="X" l="FRE"><s0>Plante fruitière</s0><s5>41</s5></fC07><fC07 i1="10" i2="X" l="ENG"><s0>Fruit crop</s0><s5>41</s5></fC07><fC07 i1="10" i2="X" l="SPA"><s0>Planta frutal</s0><s5>41</s5></fC07><fC07 i1="11" i2="X" l="FRE"><s0>Microorganisme</s0><s5>43</s5></fC07><fC07 i1="11" i2="X" l="ENG"><s0>Microorganism</s0><s5>43</s5></fC07><fC07 i1="11" i2="X" l="SPA"><s0>Microorganismo</s0><s5>43</s5></fC07><fC07 i1="12" i2="X" l="FRE"><s0>Procaryote</s0><s2>NS</s2><s5>44</s5></fC07><fC07 i1="12" i2="X" l="ENG"><s0>Prokaryote</s0><s2>NS</s2><s5>44</s5></fC07><fC07 i1="12" i2="X" l="SPA"><s0>Procariota</s0><s2>NS</s2><s5>44</s5></fC07><fC07 i1="13" i2="X" l="FRE"><s0>Rhizobiales</s0><s4>INC</s4><s5>69</s5></fC07><fC07 i1="14" i2="X" l="FRE"><s0>Alphaproteobacteria</s0><s4>INC</s4><s5>70</s5></fC07><fC07 i1="15" i2="X" l="FRE"><s0>Proteobacteria</s0><s4>INC</s4><s5>71</s5></fC07><fN21><s1>226</s1></fN21><fN44 i1="01"><s1>OTO</s1></fN44><fN82><s1>OTO</s1></fN82></pA></standard><server><NO>PASCAL 12-0297411 INIST</NO><ET>Influence of temperature on infection and establishment of 'Candidates Liberibacter americanus' and 'Candidatus Liberibacter asiaticus' in citrus plants</ET><AU>GASPAROTO (M. C. G.); COLETTA-FILHO (H. D.); BASSANEZI (R. B.); LOPES (S. A.); LOURENCO (S. A.); AMORIM (L.)</AU><AF>Departamento de Fitopatologia e Nematologia, Universidade de São Paulo/ESALQ Av. Padua Dias 11, CP 9/CEP 13418-900 Piracicaba, São Paulo/Brésil (1 aut., 5 aut., 6 aut.); Centro APTA Citros Sylvio Moreira, IAC, Rod. Anhanguera km 158, CP 4/CEP 13490-970 Cordeirópolis, São Paulo/Brésil (2 aut.); Fundo de Defesa da Citricultura (FUNDECITRUS), Av. Dr. Adhemar Pereira de Barros 201, Vila Melhado/CEP 14807-040 Araraquara, São Paulo/Brésil (3 aut., 4 aut.)</AF><DT>Publication en série; Niveau analytique</DT><SO>Plant pathology; ISSN 0032-0862; Coden PLPAAD; Royaume-Uni; Da. 2012; Vol. 61; No. 4; Pp. 658-664; Bibl. 3/4 p.</SO><LA>Anglais</LA><EA>The objectives of this work were (i) to determine the influence of temperature on infection of citrus by 'Candidatus Liberibacter asiaticus' and 'Candidatus Liberibacter americanus', the two bacterial species associated with citrus huanglongbing (HLB) in Brazil, and (ii) to determine the influence of temperature on citrus colonization by 'Ca. L. asiaticus', which has taken over from 'Ca. L. americanus' as the predominant species in Brazil since 2008. Two experiments were carried out with graft-inoculated Valencia oranges on Rangpur lime rootstocks. Immediately after inoculation the plants were maintained for 423 days in growth chambers under the following night/day temperature conditions: 17/22, 22/27 or 27/32°C, with a dark/light photoperiod of 8/16 h. Infection and colonization of plants were determined using quantitative PCR (qPCR). 'Candidatus Liberibacter americanus' did not infect the plants maintained at 27/32°C; however, infection by 'Ca. L. asiaticus' occurred at all studied temperatures. Two months after inoculation, 'Ca. L. asiaticus' was distributed throughout the inoculated plants, with mean C, values in the range of 30-31 for leaves and 25-28 for roots. Over time, 'Ca. L. asiaticus' reached the highest titres in mature leaves (mean C<sub>t</sub> value = 26.7) of citrus plants maintained at 22/27°C. 'Candidatus Liberibacter asiaticus' colonization of citrus plants was negatively affected by the daily temperature regime of 27/32°C (mean C<sub>t</sub> value in mature leaves = 33.6).</EA><CC>002A34F</CC><FD>Effet température; Infection; Colonisation; Phytopathologie; Rutaceae; Citrus sinensis; <<>>; Liberibacter americanus; Liberibacter asiaticus</FD><FG>Dicotyledones; Angiospermae; Spermatophyta; Phytopathogène; Rhizobiaceae; Bactérie; Facteur milieu; Agrume; Arbre fruitier; Plante fruitière; Microorganisme; Procaryote; Rhizobiales; Alphaproteobacteria; Proteobacteria</FG><ED>Temperature effect; Infection; Colonization; Plant pathology; Rutaceae; Citrus sinensis</ED><EG>Dicotyledones; Angiospermae; Spermatophyta; Plant pathogen; Rhizobiaceae; Bacteria; Environmental factor; Citrus fruit; Fruit tree; Fruit crop; Microorganism; Prokaryote</EG><SD>Efecto temperatura; Infección; Colonización; Fitopatología; Rutaceae; Citrus sinensis</SD><LO>INIST-7414.354000500840120050</LO><ID>12-0297411</ID></server></inist></record>Pour manipuler ce document sous Unix (Dilib)
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